Pedulum, and it's characteristics

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SUMMARY

The discussion centers on a pendulum problem involving a 2.0 m long pendulum released at a 25-degree angle with an initial speed of 1.2 m/s. The key question is determining which component of the triangle represents the length of the pendulum. The user speculates that the length corresponds to the side opposite the angle, seeking clarification on using trigonometric functions to calculate height for potential energy. The correct approach involves using the cosine function to find the height based on the angle provided.

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  • Understanding of basic pendulum mechanics
  • Knowledge of trigonometric functions (sine and cosine)
  • Familiarity with potential energy calculations
  • Ability to analyze geometric relationships in triangles
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  • Learn how to apply trigonometric functions in physics problems
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Students studying physics, particularly those focusing on mechanics and energy conservation, as well as educators looking for examples of pendulum problems in teaching materials.

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Homework Statement



A pendulum, 2.0 m in length, is released with a push when the string is at an angle of 25 o from the vertical. If the initial speed of the pendulum bob is 1.2 m/s, what is its speed at the bottom of the swing?

Homework Equations


My question is:

which component of the below triangle i attempted to draw is the 2.O meter i was given.

the stationary, 'stick' part of the pendulum?
or the string it is on?


The Attempt at a Solution



Little things like this could REALLY mess someone up on a test.


|\<---angle of 25*
| \
| \
| \
a b

im guessing b. but whatyall think?
 
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Also, the reason I am asking is cause I think i need to find the HEIGHT to get the potential energy initial..

am i right baout this?

and to get the height i will need to use the sine or cosine function, but wghich?
 

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